Cicadas. Those buzzing, noisy insects that seem to emerge from nowhere in massive numbers. While generally harmless, a large cicada brood can seem like a plague, leaving some homeowners worried about the health of their trees. But how much damage do they really do, and what steps can you take to protect your beloved trees? Let's dive in.
Understanding Cicada Damage
The good news is that cicadas rarely cause fatal damage to healthy, mature trees. Their feeding activity primarily involves nymphs sucking sap from roots, and adults using their needle-like mouthparts to pierce twigs and branches. While this sap-sucking can weaken a tree, especially young or already stressed ones, it's usually not enough to kill it.
What to look for:
- Wilting or yellowing leaves: This is a common sign of stress, though it could be caused by other factors as well.
- Dieback of small branches: Cicadas often feed on the smaller branches, causing them to die back.
- Excessive sap flow: You might see sap oozing from the feeding wounds.
Which trees are most vulnerable? While cicadas aren't picky eaters, younger trees and those already stressed from drought, disease, or other factors are more susceptible to significant damage.
Protecting Your Trees from Cicadas
While complete protection is difficult, you can take steps to minimize the impact of cicadas on your trees:
1. Water Deeply and Regularly
Healthy trees are more resilient. Ensure your trees receive adequate water, especially during dry periods. Deep watering encourages strong root growth, which helps the trees withstand cicada feeding.
2. Mulch Around the Base
Applying a layer of mulch around the base of your trees helps retain moisture, suppresses weeds, and regulates soil temperature. This creates a healthier environment for root growth, making your trees stronger against cicada attacks.
3. Protect Young Trees
Young trees are the most vulnerable. Consider using tree wrap or mesh netting to protect the trunk and branches from adult cicada feeding. This physical barrier prevents them from accessing the tree's tissues. Remember to remove the protective covering once the cicada emergence has ended.
4. Monitor for Other Problems
Cicadas can stress trees, making them more vulnerable to other problems like diseases and pests. Regularly inspect your trees for signs of disease or insect infestations. Early detection and treatment are crucial for maintaining tree health.
5. Consider Insecticides (Use with Caution!)
Insecticides are generally not recommended for cicada control unless you're dealing with a severe infestation on a small, valuable tree. Broad-spectrum insecticides can harm beneficial insects and pollinators. If you choose this route, consult with an arborist to select the appropriate insecticide and application method.
When to Call a Professional
If you notice significant dieback, widespread wilting, or other signs of severe stress on your trees, it's best to consult with a certified arborist. They can assess the situation, determine the extent of damage, and recommend appropriate treatment.
By understanding cicada behavior and taking proactive steps, you can help your trees withstand the cicada emergence and thrive for years to come. Remember, healthy trees are better equipped to handle the challenges presented by these noisy insects.
